What two numbers multiplies out to -600 and adds up to ten?
In the case I would first write ALL factors of 600 and find the
differences.
1x600
2x300
3x200
4x150
5x120
6x100
8x75
10x60
12x50
15x40
20x30
24x25
The one that subtracts to give the answer is -20 and 30